declaration.cpp

// Copyright 2014 Tony Wasserka
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
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//       be used to endorse or promote products derived from this software
//       without specific prior written permission.
//
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#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/phoenix/core/reference.hpp>
#include <boost/spirit/include/qi.hpp>

#include "nihstro/parser_assembly.h"
#include "nihstro/parser_assembly_private.h"

#include "nihstro/shader_binary.h"
#include "nihstro/shader_bytecode.h"

using spirit::_1;
using spirit::_2;
using spirit::_3;
using spirit::_4;

using namespace nihstro;

// Adapt parser data structures for use with boost::spirit

BOOST_FUSION_ADAPT_STRUCT(
                          ConditionInput,
                          (bool, invert)
                          (Identifier, identifier)
                          (boost::optional<InputSwizzlerMask>, swizzler_mask)
                          )

BOOST_FUSION_ADAPT_STRUCT(
                          StatementDeclaration::Extra,
                          (std::vector<float>, constant_value)
                          (boost::optional<OutputRegisterInfo::Type>, output_semantic)
                          )

BOOST_FUSION_ADAPT_STRUCT(
                          StatementDeclaration,
                          (std::string, alias_name)
                          (Identifier, identifier_start)
                          (boost::optional<Identifier>, identifier_end)
                          (boost::optional<InputSwizzlerMask>, swizzle_mask)
                          (StatementDeclaration::Extra, extra)
                          )

// Manually define a swap() overload for qi::hold to work.
/*namespace boost {
 namespace spirit {
 void swap(nihstro::Condition& a, nihstro::Condition& b) {
 boost::fusion::swap(a, b);
 }
 }
 }*/

template<>
DeclarationParser<ParserIterator>::DeclarationParser(const ParserContext& context)
: DeclarationParser::base_type(declaration),
common(context),
identifier(common.identifier), swizzle_mask(common.swizzle_mask),
end_of_statement(common.end_of_statement),
diagnostics(common.diagnostics) {
    
    // Setup symbol table
    output_semantics.add("position", OutputRegisterInfo::POSITION);
    output_semantics.add("quaternion", OutputRegisterInfo::QUATERNION);
    output_semantics.add("color", OutputRegisterInfo::COLOR);
    output_semantics.add("texcoord0", OutputRegisterInfo::TEXCOORD0);
    output_semantics.add("texcoord1", OutputRegisterInfo::TEXCOORD1);
    output_semantics.add("texcoord2", OutputRegisterInfo::TEXCOORD2);
    output_semantics.add("view", OutputRegisterInfo::VIEW);
    output_semantics_rule = qi::lexeme[output_semantics];
    
    // Setup rules
    
    alias_identifier = qi::omit[qi::lexeme["alias" >> ascii::blank]] > identifier;
    
    // e.g. 5.4 or (1.1, 2, 3)
    constant = (qi::repeat(1)[qi::float_]
                | (qi::lit('(') > (qi::float_ % qi::lit(',')) > qi::lit(')')));
    
    dummy_const = qi::attr(std::vector<float>());
    dummy_semantic = qi::attr(boost::optional<OutputRegisterInfo::Type>());
    
    // match a constant or a semantic, and fill the respective other one with a dummy
    const_or_semantic = (dummy_const >> output_semantics_rule) | (constant >> dummy_semantic);
    
    // TODO: Would like to use +ascii::blank instead, but somehow that fails to parse lines like ".alias name o2.xy texcoord0" correctly
    string_as = qi::omit[qi::no_skip[*/*+*/ascii::blank >> qi::lit("as") >> +ascii::blank]];
    
    declaration = (((qi::lit('.') > alias_identifier) >> identifier >> -(qi::lit('-') > identifier) >> -(qi::lit('.') > swizzle_mask))
                   >> (
                       (string_as > const_or_semantic)
                       | (dummy_const >> dummy_semantic)
                       ))
    > end_of_statement;
    
    // Error handling
    output_semantics_rule.name("output semantic after \"as\"");
    alias_identifier.name("known preprocessor directive (i.e. alias).");
    const_or_semantic.name("constant or semantic after \"as\"");
    
    // BOOST_SPIRIT_DEBUG_NODE(output_semantics_rule);
    // BOOST_SPIRIT_DEBUG_NODE(constant);
    // BOOST_SPIRIT_DEBUG_NODE(alias_identifier);
    // BOOST_SPIRIT_DEBUG_NODE(const_or_semantic);
    // BOOST_SPIRIT_DEBUG_NODE(declaration);
    
    // qi::on_error<qi::fail>(declaration, error_handler(phoenix::ref(diagnostics), _1, _2, _3, _4));
}